七麦数据

The navigation through the COLREG rule allows you to study the rules efficiently and fast. There are also available informative illustration of lights, day shapes, sound signals and flash cards that will make the process of studying much faster.

The navigation through the COLREG rule allows you to study the rules efficiently and fast. There are also available informative illustration of lights, day shapes, sound signals and flash cards that will make the process of studying much faster.